Google claims milestone in quantum error correction

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Google claims milestone in quantum error correction
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'We reached the break-even point' on roadmap, say boffins in peer reviewed paper, but it's still 'not good enough'

Google is claiming a new milestone on the road to fault-tolerant quantum computers with a demonstration that a key error correction method that groups multiple qubits into logical qubits can deliver lower error rates, paving the way for quantum systems that can scale reliably.said it has demonstrated that a method of quantum error correction called surface codes can exhibit lower error rates as larger surface codes are employed.

"The only way to achieve this is by introducing quantum error correction," he said,"and our team was able for the first time to demonstrate, in practice, that qubits protected by surface code error correction can indeed be scaled to reach lower error rates." As described in the paper, surface codes are a family of quantum error-correcting codes whereby a logical qubit is defined by the joint entangled state of a d × d square of physical qubits, referred to as data qubits. Errors are detected by periodically measuring special"measure qubits" interspersed with the data qubits, such that there is one less measure qubit.

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